On the [3 + 2] annulation of cyclic allylsilanes with N-phenyltriazolinedione: an enantio- and diastereoselective synthesis of cis-1,3-diaminocyclitols.

Improved conditions were found to trigger [3 + 2] annulation of cyclic allylsilanes with N-phenyltriazolinedione (PTAD); the products from this reaction were readily tailored into cis-1,3-diaminocyclitols in highly enantioenriched form with full stereochemical control of up to four contiguous stereogenic centers.